Finding the Fourth Proportional to 99,772.74, 137,680.86 and 56,746.42

Step by Step Solution

1. Step 1: Write the proportion equation
   99,772.74 : 137,680.86 = 56,746.42 : x
2. Step 2: Convert to fraction form
   99,772.74/137,680.86 = 56,746.42/x
3. Step 3: Cross multiply
   99,772.74x = 137,680.86 × 56,746.42
4. Step 4: Simplify right side
   99,772.74x = 7,812,895,907.52
5. Step 5: Solve for x
   x = 7,812,895,907.52/99,772.74
6. Step 6: Final answer
   x = 78,306.92