Finding the Fourth Proportional to 128,667.40, 193,034.70 and 49,784.20

Step by Step Solution

1. Step 1: Write the proportion equation
   128,667.40 : 193,034.70 = 49,784.20 : x
2. Step 2: Convert to fraction form
   128,667.40/193,034.70 = 49,784.20/x
3. Step 3: Cross multiply
   128,667.40x = 193,034.70 × 49,784.20
4. Step 4: Simplify right side
   128,667.40x = 9,610,078,111.74
5. Step 5: Solve for x
   x = 9,610,078,111.74/128,667.40
6. Step 6: Final answer
   x = 74,689.30