Finding the Fourth Proportional to 31,142.94, 42,977.25 and 19,213.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,142.94 : 42,977.25 = 19,213.20 : x
2. Step 2: Convert to fraction form
   31,142.94/42,977.25 = 19,213.20/x
3. Step 3: Cross multiply
   31,142.94x = 42,977.25 × 19,213.20
4. Step 4: Simplify right side
   31,142.94x = 825,730,499.70
5. Step 5: Solve for x
   x = 825,730,499.70/31,142.94
6. Step 6: Final answer
   x = 26,514.21