Finding the Fourth Proportional to 64,789.61, 89,412.66 and 36,111.15

Step by Step Solution

1. Step 1: Write the proportion equation
   64,789.61 : 89,412.66 = 36,111.15 : x
2. Step 2: Convert to fraction form
   64,789.61/89,412.66 = 36,111.15/x
3. Step 3: Cross multiply
   64,789.61x = 89,412.66 × 36,111.15
4. Step 4: Simplify right side
   64,789.61x = 3,228,793,977.16
5. Step 5: Solve for x
   x = 3,228,793,977.16/64,789.61
6. Step 6: Final answer
   x = 49,835.06