Finding the Fourth Proportional to 14,128.86, 21,200.58 and 5,815.02

Step by Step Solution

1. Step 1: Write the proportion equation
   14,128.86 : 21,200.58 = 5,815.02 : x
2. Step 2: Convert to fraction form
   14,128.86/21,200.58 = 5,815.02/x
3. Step 3: Cross multiply
   14,128.86x = 21,200.58 × 5,815.02
4. Step 4: Simplify right side
   14,128.86x = 123,281,796.71
5. Step 5: Solve for x
   x = 123,281,796.71/14,128.86
6. Step 6: Final answer
   x = 8,725.53