Finding the Fourth Proportional to 85,864.15, 128,870.34 and 59,587.34

Step by Step Solution

1. Step 1: Write the proportion equation
   85,864.15 : 128,870.34 = 59,587.34 : x
2. Step 2: Convert to fraction form
   85,864.15/128,870.34 = 59,587.34/x
3. Step 3: Cross multiply
   85,864.15x = 128,870.34 × 59,587.34
4. Step 4: Simplify right side
   85,864.15x = 7,679,040,765.50
5. Step 5: Solve for x
   x = 7,679,040,765.50/85,864.15
6. Step 6: Final answer
   x = 89,432.44