Finding the Fourth Proportional to 99,697.57, 137,578.84 and 54,985.57

Step by Step Solution

1. Step 1: Write the proportion equation
   99,697.57 : 137,578.84 = 54,985.57 : x
2. Step 2: Convert to fraction form
   99,697.57/137,578.84 = 54,985.57/x
3. Step 3: Cross multiply
   99,697.57x = 137,578.84 × 54,985.57
4. Step 4: Simplify right side
   99,697.57x = 7,564,850,937.34
5. Step 5: Solve for x
   x = 7,564,850,937.34/99,697.57
6. Step 6: Final answer
   x = 75,877.99