Finding the Fourth Proportional to 113,380.31, 156,471.29 and 64,990.29

Step by Step Solution

1. Step 1: Write the proportion equation
   113,380.31 : 156,471.29 = 64,990.29 : x
2. Step 2: Convert to fraction form
   113,380.31/156,471.29 = 64,990.29/x
3. Step 3: Cross multiply
   113,380.31x = 156,471.29 × 64,990.29
4. Step 4: Simplify right side
   113,380.31x = 10,169,113,602.06
5. Step 5: Solve for x
   x = 10,169,113,602.06/113,380.31
6. Step 6: Final answer
   x = 89,690.30