Finding the Fourth Proportional to 171,665.96, 256,798.56 and 138,423.56

Step by Step Solution

1. Step 1: Write the proportion equation
   171,665.96 : 256,798.56 = 138,423.56 : x
2. Step 2: Convert to fraction form
   171,665.96/256,798.56 = 138,423.56/x
3. Step 3: Cross multiply
   171,665.96x = 256,798.56 × 138,423.56
4. Step 4: Simplify right side
   171,665.96x = 35,546,970,878.07
5. Step 5: Solve for x
   x = 35,546,970,878.07/171,665.96
6. Step 6: Final answer
   x = 207,070.59