Finding the Fourth Proportional to 99,428.99, 137,214.88 and 54,109.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99,428.99 : 137,214.88 = 54,109.89 : x
2. Step 2: Convert to fraction form
   99,428.99/137,214.88 = 54,109.89/x
3. Step 3: Cross multiply
   99,428.99x = 137,214.88 × 54,109.89
4. Step 4: Simplify right side
   99,428.99x = 7,424,681,927.89
5. Step 5: Solve for x
   x = 7,424,681,927.89/99,428.99
6. Step 6: Final answer
   x = 74,673.21