Finding the Fourth Proportional to 72,438.17, 99,947.32 and 42,206.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72,438.17 : 99,947.32 = 42,206.31 : x
2. Step 2: Convert to fraction form
   72,438.17/99,947.32 = 42,206.31/x
3. Step 3: Cross multiply
   72,438.17x = 99,947.32 × 42,206.31
4. Step 4: Simplify right side
   72,438.17x = 4,218,407,466.07
5. Step 5: Solve for x
   x = 4,218,407,466.07/72,438.17
6. Step 6: Final answer
   x = 58,234.60