Finding the Fourth Proportional to 10,403.18, 15,601.35 and 5,205.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,403.18 : 15,601.35 = 5,205.50 : x
2. Step 2: Convert to fraction form
   10,403.18/15,601.35 = 5,205.50/x
3. Step 3: Cross multiply
   10,403.18x = 15,601.35 × 5,205.50
4. Step 4: Simplify right side
   10,403.18x = 81,212,827.43
5. Step 5: Solve for x
   x = 81,212,827.43/10,403.18
6. Step 6: Final answer
   x = 7,806.54