Finding the Fourth Proportional to 1,390,870.82, 1,919,272.65 and 787,258.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390,870.82 : 1,919,272.65 = 787,258.82 : x
2. Step 2: Convert to fraction form
   1,390,870.82/1,919,272.65 = 787,258.82/x
3. Step 3: Cross multiply
   1,390,870.82x = 1,919,272.65 × 787,258.82
4. Step 4: Simplify right side
   1,390,870.82x = 1,510,964,321,697.27
5. Step 5: Solve for x
   x = 1,510,964,321,697.27/1,390,870.82
6. Step 6: Final answer
   x = 1,086,344.11