Finding the Fourth Proportional to 82,278.10, 123,421.20 and 42,912.10

Step by Step Solution

1. Step 1: Write the proportion equation
   82,278.10 : 123,421.20 = 42,912.10 : x
2. Step 2: Convert to fraction form
   82,278.10/123,421.20 = 42,912.10/x
3. Step 3: Cross multiply
   82,278.10x = 123,421.20 × 42,912.10
4. Step 4: Simplify right side
   82,278.10x = 5,296,262,876.52
5. Step 5: Solve for x
   x = 5,296,262,876.52/82,278.10
6. Step 6: Final answer
   x = 64,370.26