Finding the Fourth Proportional to 99,608.76, 137,457.72 and 54,288.18

Step by Step Solution

1. Step 1: Write the proportion equation
   99,608.76 : 137,457.72 = 54,288.18 : x
2. Step 2: Convert to fraction form
   99,608.76/137,457.72 = 54,288.18/x
3. Step 3: Cross multiply
   99,608.76x = 137,457.72 × 54,288.18
4. Step 4: Simplify right side
   99,608.76x = 7,462,329,445.75
5. Step 5: Solve for x
   x = 7,462,329,445.75/99,608.76
6. Step 6: Final answer
   x = 74,916.40