Finding the Fourth Proportional to 315,513.76, 473,271.99 and 78,856.78

Step by Step Solution

1. Step 1: Write the proportion equation
   315,513.76 : 473,271.99 = 78,856.78 : x
2. Step 2: Convert to fraction form
   315,513.76/473,271.99 = 78,856.78/x
3. Step 3: Cross multiply
   315,513.76x = 473,271.99 × 78,856.78
4. Step 4: Simplify right side
   315,513.76x = 37,320,705,195.59
5. Step 5: Solve for x
   x = 37,320,705,195.59/315,513.76
6. Step 6: Final answer
   x = 118,285.51