Finding the Fourth Proportional to 1,428,498.55, 1,971,351.93 and 783,978.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428,498.55 : 1,971,351.93 = 783,978.70 : x
2. Step 2: Convert to fraction form
   1,428,498.55/1,971,351.93 = 783,978.70/x
3. Step 3: Cross multiply
   1,428,498.55x = 1,971,351.93 × 783,978.70
4. Step 4: Simplify right side
   1,428,498.55x = 1,545,497,923,323.89
5. Step 5: Solve for x
   x = 1,545,497,923,323.89/1,428,498.55
6. Step 6: Final answer
   x = 1,081,903.74