Finding the Fourth Proportional to 9,000.30, 12,417.10 and 5,643.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,000.30 : 12,417.10 = 5,643.25 : x
2. Step 2: Convert to fraction form
   9,000.30/12,417.10 = 5,643.25/x
3. Step 3: Cross multiply
   9,000.30x = 12,417.10 × 5,643.25
4. Step 4: Simplify right side
   9,000.30x = 70,072,799.58
5. Step 5: Solve for x
   x = 70,072,799.58/9,000.30
6. Step 6: Final answer
   x = 7,785.61