Finding the Fourth Proportional to 42,807.30, 64,217.10 and 13,227.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,807.30 : 64,217.10 = 13,227.72 : x
2. Step 2: Convert to fraction form
   42,807.30/64,217.10 = 13,227.72/x
3. Step 3: Cross multiply
   42,807.30x = 64,217.10 × 13,227.72
4. Step 4: Simplify right side
   42,807.30x = 849,445,818.01
5. Step 5: Solve for x
   x = 849,445,818.01/42,807.30
6. Step 6: Final answer
   x = 19,843.48