Finding the Fourth Proportional to 56,581.12, 78,078.90 and 31,429

Step by Step Solution

1. Step 1: Write the proportion equation
   56,581.12 : 78,078.90 = 31,429 : x
2. Step 2: Convert to fraction form
   56,581.12/78,078.90 = 31,429/x
3. Step 3: Cross multiply
   56,581.12x = 78,078.90 × 31,429
4. Step 4: Simplify right side
   56,581.12x = 2,453,941,748.10
5. Step 5: Solve for x
   x = 2,453,941,748.10/56,581.12
6. Step 6: Final answer
   x = 43,370.33