Finding the Fourth Proportional to 256,802.05, 354,500.34 and 153,472.72

Step by Step Solution

1. Step 1: Write the proportion equation
   256,802.05 : 354,500.34 = 153,472.72 : x
2. Step 2: Convert to fraction form
   256,802.05/354,500.34 = 153,472.72/x
3. Step 3: Cross multiply
   256,802.05x = 354,500.34 × 153,472.72
4. Step 4: Simplify right side
   256,802.05x = 54,406,131,420.72
5. Step 5: Solve for x
   x = 54,406,131,420.72/256,802.05
6. Step 6: Final answer
   x = 211,860.19