Finding the Fourth Proportional to 256,317,667.38, 353,720,079.35 and 138,842,997.62

Step by Step Solution

1. Step 1: Write the proportion equation
   256,317,667.38 : 353,720,079.35 = 138,842,997.62 : x
2. Step 2: Convert to fraction form
   256,317,667.38/353,720,079.35 = 138,842,997.62/x
3. Step 3: Cross multiply
   256,317,667.38x = 353,720,079.35 × 138,842,997.62
4. Step 4: Simplify right side
   256,317,667.38x = 49,111,556,132,875,456
5. Step 5: Solve for x
   x = 49,111,556,132,875,456/256,317,667.38
6. Step 6: Final answer
   x = 191,604,256.68