Finding the Fourth Proportional to 99,424.27, 137,211.41 and 56,985.53

Step by Step Solution

1. Step 1: Write the proportion equation
   99,424.27 : 137,211.41 = 56,985.53 : x
2. Step 2: Convert to fraction form
   99,424.27/137,211.41 = 56,985.53/x
3. Step 3: Cross multiply
   99,424.27x = 137,211.41 × 56,985.53
4. Step 4: Simplify right side
   99,424.27x = 7,819,064,920.90
5. Step 5: Solve for x
   x = 7,819,064,920.90/99,424.27
6. Step 6: Final answer
   x = 78,643.42