Finding the Fourth Proportional to 99,429.48, 137,214.12 and 54,108.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99,429.48 : 137,214.12 = 54,108.76 : x
2. Step 2: Convert to fraction form
   99,429.48/137,214.12 = 54,108.76/x
3. Step 3: Cross multiply
   99,429.48x = 137,214.12 × 54,108.76
4. Step 4: Simplify right side
   99,429.48x = 7,424,485,887.69
5. Step 5: Solve for x
   x = 7,424,485,887.69/99,429.48
6. Step 6: Final answer
   x = 74,670.87