Finding the Fourth Proportional to 99,428.86, 137,214.71 and 54,109.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99,428.86 : 137,214.71 = 54,109.76 : x
2. Step 2: Convert to fraction form
   99,428.86/137,214.71 = 54,109.76/x
3. Step 3: Cross multiply
   99,428.86x = 137,214.71 × 54,109.76
4. Step 4: Simplify right side
   99,428.86x = 7,424,655,026.57
5. Step 5: Solve for x
   x = 7,424,655,026.57/99,428.86
6. Step 6: Final answer
   x = 74,673.04