Finding the Fourth Proportional to 9,411.74, 12,988.27 and 6,427.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.74 : 12,988.27 = 6,427.50 : x
2. Step 2: Convert to fraction form
   9,411.74/12,988.27 = 6,427.50/x
3. Step 3: Cross multiply
   9,411.74x = 12,988.27 × 6,427.50
4. Step 4: Simplify right side
   9,411.74x = 83,482,105.43
5. Step 5: Solve for x
   x = 83,482,105.43/9,411.74
6. Step 6: Final answer
   x = 8,870.00