Finding the Fourth Proportional to 15,591.48, 21,499.86 and 10,279.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,591.48 : 21,499.86 = 10,279.50 : x
2. Step 2: Convert to fraction form
   15,591.48/21,499.86 = 10,279.50/x
3. Step 3: Cross multiply
   15,591.48x = 21,499.86 × 10,279.50
4. Step 4: Simplify right side
   15,591.48x = 221,007,810.87
5. Step 5: Solve for x
   x = 221,007,810.87/15,591.48
6. Step 6: Final answer
   x = 14,174.91