Finding the Fourth Proportional to 115,864.83, 159,856.29 and 64,870.05

Step by Step Solution

1. Step 1: Write the proportion equation
   115,864.83 : 159,856.29 = 64,870.05 : x
2. Step 2: Convert to fraction form
   115,864.83/159,856.29 = 64,870.05/x
3. Step 3: Cross multiply
   115,864.83x = 159,856.29 × 64,870.05
4. Step 4: Simplify right side
   115,864.83x = 10,369,885,525.11
5. Step 5: Solve for x
   x = 10,369,885,525.11/115,864.83
6. Step 6: Final answer
   x = 89,499.86