Finding the Fourth Proportional to 245,844.72, 339,266.88 and 138,429

Step by Step Solution

1. Step 1: Write the proportion equation
   245,844.72 : 339,266.88 = 138,429 : x
2. Step 2: Convert to fraction form
   245,844.72/339,266.88 = 138,429/x
3. Step 3: Cross multiply
   245,844.72x = 339,266.88 × 138,429
4. Step 4: Simplify right side
   245,844.72x = 46,964,374,931.52
5. Step 5: Solve for x
   x = 46,964,374,931.52/245,844.72
6. Step 6: Final answer
   x = 191,032.68