Finding the Fourth Proportional to 8,978.57, 12,385.47 and 7,473.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.57 : 12,385.47 = 7,473.72 : x
2. Step 2: Convert to fraction form
   8,978.57/12,385.47 = 7,473.72/x
3. Step 3: Cross multiply
   8,978.57x = 12,385.47 × 7,473.72
4. Step 4: Simplify right side
   8,978.57x = 92,565,534.85
5. Step 5: Solve for x
   x = 92,565,534.85/8,978.57
6. Step 6: Final answer
   x = 10,309.61