Finding the Fourth Proportional to 1,290,064.83, 1,780,323.71 and 709,312.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290,064.83 : 1,780,323.71 = 709,312.44 : x
2. Step 2: Convert to fraction form
   1,290,064.83/1,780,323.71 = 709,312.44/x
3. Step 3: Cross multiply
   1,290,064.83x = 1,780,323.71 × 709,312.44
4. Step 4: Simplify right side
   1,290,064.83x = 1,262,805,757,859.60
5. Step 5: Solve for x
   x = 1,262,805,757,859.60/1,290,064.83
6. Step 6: Final answer
   x = 978,870.00