Finding the Fourth Proportional to 138,368.52, 207,290.34 and 82,089.72

Step by Step Solution

1. Step 1: Write the proportion equation
   138,368.52 : 207,290.34 = 82,089.72 : x
2. Step 2: Convert to fraction form
   138,368.52/207,290.34 = 82,089.72/x
3. Step 3: Cross multiply
   138,368.52x = 207,290.34 × 82,089.72
4. Step 4: Simplify right side
   138,368.52x = 17,016,405,969.30
5. Step 5: Solve for x
   x = 17,016,405,969.30/138,368.52
6. Step 6: Final answer
   x = 122,978.88