Finding the Fourth Proportional to 113,380.07, 156,470.96 and 64,990.05

Step by Step Solution

1. Step 1: Write the proportion equation
   113,380.07 : 156,470.96 = 64,990.05 : x
2. Step 2: Convert to fraction form
   113,380.07/156,470.96 = 64,990.05/x
3. Step 3: Cross multiply
   113,380.07x = 156,470.96 × 64,990.05
4. Step 4: Simplify right side
   113,380.07x = 10,169,054,724.09
5. Step 5: Solve for x
   x = 10,169,054,724.09/113,380.07
6. Step 6: Final answer
   x = 89,689.97