Finding the Fourth Proportional to 138,369.52, 207,291.84 and 82,090.72

Step by Step Solution

1. Step 1: Write the proportion equation
   138,369.52 : 207,291.84 = 82,090.72 : x
2. Step 2: Convert to fraction form
   138,369.52/207,291.84 = 82,090.72/x
3. Step 3: Cross multiply
   138,369.52x = 207,291.84 × 82,090.72
4. Step 4: Simplify right side
   138,369.52x = 17,016,736,395.72
5. Step 5: Solve for x
   x = 17,016,736,395.72/138,369.52
6. Step 6: Final answer
   x = 122,980.38