Finding the Fourth Proportional to 919,131.30, 1,379,820.15 and 520,049.70

Step by Step Solution

1. Step 1: Write the proportion equation
   919,131.30 : 1,379,820.15 = 520,049.70 : x
2. Step 2: Convert to fraction form
   919,131.30/1,379,820.15 = 520,049.70/x
3. Step 3: Cross multiply
   919,131.30x = 1,379,820.15 × 520,049.70
4. Step 4: Simplify right side
   919,131.30x = 717,575,055,061.46
5. Step 5: Solve for x
   x = 717,575,055,061.46/919,131.30
6. Step 6: Final answer
   x = 780,710.06