Finding the Fourth Proportional to 1,388,082.15, 1,915,540.25 and 776,227.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,082.15 : 1,915,540.25 = 776,227.91 : x
2. Step 2: Convert to fraction form
   1,388,082.15/1,915,540.25 = 776,227.91/x
3. Step 3: Cross multiply
   1,388,082.15x = 1,915,540.25 × 776,227.91
4. Step 4: Simplify right side
   1,388,082.15x = 1,486,895,791,319.54
5. Step 5: Solve for x
   x = 1,486,895,791,319.54/1,388,082.15
6. Step 6: Final answer
   x = 1,071,187.17