Finding the Fourth Proportional to 99,413.16, 137,193.30 and 56,985

Step by Step Solution

1. Step 1: Write the proportion equation
   99,413.16 : 137,193.30 = 56,985 : x
2. Step 2: Convert to fraction form
   99,413.16/137,193.30 = 56,985/x
3. Step 3: Cross multiply
   99,413.16x = 137,193.30 × 56,985
4. Step 4: Simplify right side
   99,413.16x = 7,817,960,200.50
5. Step 5: Solve for x
   x = 7,817,960,200.50/99,413.16
6. Step 6: Final answer
   x = 78,641.10