Finding the Fourth Proportional to 42,648.56, 63,982.68 and 13,070.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,648.56 : 63,982.68 = 13,070.72 : x
2. Step 2: Convert to fraction form
   42,648.56/63,982.68 = 13,070.72/x
3. Step 3: Cross multiply
   42,648.56x = 63,982.68 × 13,070.72
4. Step 4: Simplify right side
   42,648.56x = 836,299,695.13
5. Step 5: Solve for x
   x = 836,299,695.13/42,648.56
6. Step 6: Final answer
   x = 19,609.10