Finding the Fourth Proportional to 1,290,499.38, 1,780,796.54 and 709,762.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290,499.38 : 1,780,796.54 = 709,762.79 : x
2. Step 2: Convert to fraction form
   1,290,499.38/1,780,796.54 = 709,762.79/x
3. Step 3: Cross multiply
   1,290,499.38x = 1,780,796.54 × 709,762.79
4. Step 4: Simplify right side
   1,290,499.38x = 1,263,943,108,199.95
5. Step 5: Solve for x
   x = 1,263,943,108,199.95/1,290,499.38
6. Step 6: Final answer
   x = 979,421.71