Finding the Fourth Proportional to 9,120.32, 12,587.22 and 5,142.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,120.32 : 12,587.22 = 5,142.68 : x
2. Step 2: Convert to fraction form
   9,120.32/12,587.22 = 5,142.68/x
3. Step 3: Cross multiply
   9,120.32x = 12,587.22 × 5,142.68
4. Step 4: Simplify right side
   9,120.32x = 64,731,981.61
5. Step 5: Solve for x
   x = 64,731,981.61/9,120.32
6. Step 6: Final answer
   x = 7,097.56