Finding the Fourth Proportional to 31,148.90, 42,978.86 and 19,814.26

Step by Step Solution

1. Step 1: Write the proportion equation
   31,148.90 : 42,978.86 = 19,814.26 : x
2. Step 2: Convert to fraction form
   31,148.90/42,978.86 = 19,814.26/x
3. Step 3: Cross multiply
   31,148.90x = 42,978.86 × 19,814.26
4. Step 4: Simplify right side
   31,148.90x = 851,594,306.54
5. Step 5: Solve for x
   x = 851,594,306.54/31,148.90
6. Step 6: Final answer
   x = 27,339.47