Finding the Fourth Proportional to 315,085.62, 472,626 and 78,426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   315,085.62 : 472,626 = 78,426.72 : x
2. Step 2: Convert to fraction form
   315,085.62/472,626 = 78,426.72/x
3. Step 3: Cross multiply
   315,085.62x = 472,626 × 78,426.72
4. Step 4: Simplify right side
   315,085.62x = 37,066,506,966.72
5. Step 5: Solve for x
   x = 37,066,506,966.72/315,085.62
6. Step 6: Final answer
   x = 117,639.48