Finding the Fourth Proportional to 167,978.56, 231,722.16 and 99,947.20

Step by Step Solution

1. Step 1: Write the proportion equation
   167,978.56 : 231,722.16 = 99,947.20 : x
2. Step 2: Convert to fraction form
   167,978.56/231,722.16 = 99,947.20/x
3. Step 3: Cross multiply
   167,978.56x = 231,722.16 × 99,947.20
4. Step 4: Simplify right side
   167,978.56x = 23,159,981,069.95
5. Step 5: Solve for x
   x = 23,159,981,069.95/167,978.56
6. Step 6: Final answer
   x = 137,874.63