Finding the Fourth Proportional to 113,385.84, 156,473.61 and 64,986.72

Step by Step Solution

1. Step 1: Write the proportion equation
   113,385.84 : 156,473.61 = 64,986.72 : x
2. Step 2: Convert to fraction form
   113,385.84/156,473.61 = 64,986.72/x
3. Step 3: Cross multiply
   113,385.84x = 156,473.61 × 64,986.72
4. Step 4: Simplify right side
   113,385.84x = 10,168,706,680.46
5. Step 5: Solve for x
   x = 10,168,706,680.46/113,385.84
6. Step 6: Final answer
   x = 89,682.33