Finding the Fourth Proportional to 99,856.71, 137,802.51 and 54,535.05

Step by Step Solution

1. Step 1: Write the proportion equation
   99,856.71 : 137,802.51 = 54,535.05 : x
2. Step 2: Convert to fraction form
   99,856.71/137,802.51 = 54,535.05/x
3. Step 3: Cross multiply
   99,856.71x = 137,802.51 × 54,535.05
4. Step 4: Simplify right side
   99,856.71x = 7,515,066,772.98
5. Step 5: Solve for x
   x = 7,515,066,772.98/99,856.71
6. Step 6: Final answer
   x = 75,258.51