Finding the Fourth Proportional to 1,420,830.72, 1,960,763.76 and 776,258.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420,830.72 : 1,960,763.76 = 776,258.64 : x
2. Step 2: Convert to fraction form
   1,420,830.72/1,960,763.76 = 776,258.64/x
3. Step 3: Cross multiply
   1,420,830.72x = 1,960,763.76 × 776,258.64
4. Step 4: Simplify right side
   1,420,830.72x = 1,522,059,809,698.89
5. Step 5: Solve for x
   x = 1,522,059,809,698.89/1,420,830.72
6. Step 6: Final answer
   x = 1,071,246.41