Finding the Fourth Proportional to 112,139.47, 168,018.79 and 67,672.78

Step by Step Solution

1. Step 1: Write the proportion equation
   112,139.47 : 168,018.79 = 67,672.78 : x
2. Step 2: Convert to fraction form
   112,139.47/168,018.79 = 67,672.78/x
3. Step 3: Cross multiply
   112,139.47x = 168,018.79 × 67,672.78
4. Step 4: Simplify right side
   112,139.47x = 11,370,298,693.22
5. Step 5: Solve for x
   x = 11,370,298,693.22/112,139.47
6. Step 6: Final answer
   x = 101,394.27