Finding the Fourth Proportional to 82,938.31, 124,190.58 and 45,420.32

Step by Step Solution

1. Step 1: Write the proportion equation
   82,938.31 : 124,190.58 = 45,420.32 : x
2. Step 2: Convert to fraction form
   82,938.31/124,190.58 = 45,420.32/x
3. Step 3: Cross multiply
   82,938.31x = 124,190.58 × 45,420.32
4. Step 4: Simplify right side
   82,938.31x = 5,640,775,884.59
5. Step 5: Solve for x
   x = 5,640,775,884.59/82,938.31
6. Step 6: Final answer
   x = 68,011.71