Finding the Fourth Proportional to 245,536.61, 338,840.61 and 138,106.72

Step by Step Solution

1. Step 1: Write the proportion equation
   245,536.61 : 338,840.61 = 138,106.72 : x
2. Step 2: Convert to fraction form
   245,536.61/338,840.61 = 138,106.72/x
3. Step 3: Cross multiply
   245,536.61x = 338,840.61 × 138,106.72
4. Step 4: Simplify right side
   245,536.61x = 46,796,164,057.53
5. Step 5: Solve for x
   x = 46,796,164,057.53/245,536.61
6. Step 6: Final answer
   x = 190,587.32