Finding the Fourth Proportional to 138,436.76, 207,478.56 and 67,376.27

Step by Step Solution

1. Step 1: Write the proportion equation
   138,436.76 : 207,478.56 = 67,376.27 : x
2. Step 2: Convert to fraction form
   138,436.76/207,478.56 = 67,376.27/x
3. Step 3: Cross multiply
   138,436.76x = 207,478.56 × 67,376.27
4. Step 4: Simplify right side
   138,436.76x = 13,979,131,477.77
5. Step 5: Solve for x
   x = 13,979,131,477.77/138,436.76
6. Step 6: Final answer
   x = 100,978.46