Finding the Fourth Proportional to 28,086.28, 42,108.62 and 13,277.90

Step by Step Solution

1. Step 1: Write the proportion equation
   28,086.28 : 42,108.62 = 13,277.90 : x
2. Step 2: Convert to fraction form
   28,086.28/42,108.62 = 13,277.90/x
3. Step 3: Cross multiply
   28,086.28x = 42,108.62 × 13,277.90
4. Step 4: Simplify right side
   28,086.28x = 559,114,045.50
5. Step 5: Solve for x
   x = 559,114,045.50/28,086.28
6. Step 6: Final answer
   x = 19,907.02