Finding the Fourth Proportional to 99,730.86, 137,628.63 and 56,707.98

Step by Step Solution

1. Step 1: Write the proportion equation
   99,730.86 : 137,628.63 = 56,707.98 : x
2. Step 2: Convert to fraction form
   99,730.86/137,628.63 = 56,707.98/x
3. Step 3: Cross multiply
   99,730.86x = 137,628.63 × 56,707.98
4. Step 4: Simplify right side
   99,730.86x = 7,804,641,597.47
5. Step 5: Solve for x
   x = 7,804,641,597.47/99,730.86
6. Step 6: Final answer
   x = 78,257.04