Finding the Fourth Proportional to 28,144.99, 42,189.54 and 15,670.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,144.99 : 42,189.54 = 15,670.72 : x
2. Step 2: Convert to fraction form
   28,144.99/42,189.54 = 15,670.72/x
3. Step 3: Cross multiply
   28,144.99x = 42,189.54 × 15,670.72
4. Step 4: Simplify right side
   28,144.99x = 661,140,468.27
5. Step 5: Solve for x
   x = 661,140,468.27/28,144.99
6. Step 6: Final answer
   x = 23,490.52