Finding the Fourth Proportional to 207,139.38, 309,196.87 and 177,746.10

Step by Step Solution

1. Step 1: Write the proportion equation
   207,139.38 : 309,196.87 = 177,746.10 : x
2. Step 2: Convert to fraction form
   207,139.38/309,196.87 = 177,746.10/x
3. Step 3: Cross multiply
   207,139.38x = 309,196.87 × 177,746.10
4. Step 4: Simplify right side
   207,139.38x = 54,958,536,670.76
5. Step 5: Solve for x
   x = 54,958,536,670.76/207,139.38
6. Step 6: Final answer
   x = 265,321.53