Finding the Fourth Proportional to 85,915.72, 128,910.30 and 46,500.76

Step by Step Solution

1. Step 1: Write the proportion equation
   85,915.72 : 128,910.30 = 46,500.76 : x
2. Step 2: Convert to fraction form
   85,915.72/128,910.30 = 46,500.76/x
3. Step 3: Cross multiply
   85,915.72x = 128,910.30 × 46,500.76
4. Step 4: Simplify right side
   85,915.72x = 5,994,426,921.83
5. Step 5: Solve for x
   x = 5,994,426,921.83/85,915.72
6. Step 6: Final answer
   x = 69,771.01