Finding the Fourth Proportional to 42,899.52, 64,315.20 and 13,298.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,899.52 : 64,315.20 = 13,298.88 : x
2. Step 2: Convert to fraction form
   42,899.52/64,315.20 = 13,298.88/x
3. Step 3: Cross multiply
   42,899.52x = 64,315.20 × 13,298.88
4. Step 4: Simplify right side
   42,899.52x = 855,320,126.98
5. Step 5: Solve for x
   x = 855,320,126.98/42,899.52
6. Step 6: Final answer
   x = 19,937.76