Finding the Fourth Proportional to 83,139.40, 124,622.70 and 45,641.80

Step by Step Solution

1. Step 1: Write the proportion equation
   83,139.40 : 124,622.70 = 45,641.80 : x
2. Step 2: Convert to fraction form
   83,139.40/124,622.70 = 45,641.80/x
3. Step 3: Cross multiply
   83,139.40x = 124,622.70 × 45,641.80
4. Step 4: Simplify right side
   83,139.40x = 5,688,004,348.86
5. Step 5: Solve for x
   x = 5,688,004,348.86/83,139.40
6. Step 6: Final answer
   x = 68,415.27