Finding the Third Proportional to 129,490.05 and 281,123.47

Step by Step Solution

1. Step 1: Write the proportion equation
   129,490.05 : 281,123.47 = 281,123.47 : x
2. Step 2: Convert to fraction form
   129,490.05/281,123.47 = 281,123.47/x
3. Step 3: Cross multiply
   129,490.05x = 281,123.47 × 281,123.47
4. Step 4: Simplify right side
   129,490.05x = 79,030,406,878.31
5. Step 5: Solve for x
   x = 79,030,406,878.31/129,490.05
6. Step 6: Final answer
   x = 610,320.31