Finding the Fourth Proportional to 9,888.50, 13,646.15 and 5,412.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,888.50 : 13,646.15 = 5,412.29 : x
2. Step 2: Convert to fraction form
   9,888.50/13,646.15 = 5,412.29/x
3. Step 3: Cross multiply
   9,888.50x = 13,646.15 × 5,412.29
4. Step 4: Simplify right side
   9,888.50x = 73,856,876.63
5. Step 5: Solve for x
   x = 73,856,876.63/9,888.50
6. Step 6: Final answer
   x = 7,468.97