Finding the Fourth Proportional to 1,499,640, 2,069,503.20 and 820,576.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,499,640 : 2,069,503.20 = 820,576.50 : x
2. Step 2: Convert to fraction form
   1,499,640/2,069,503.20 = 820,576.50/x
3. Step 3: Cross multiply
   1,499,640x = 2,069,503.20 × 820,576.50
4. Step 4: Simplify right side
   1,499,640x = 1,698,185,692,594.80
5. Step 5: Solve for x
   x = 1,698,185,692,594.80/1,499,640
6. Step 6: Final answer
   x = 1,132,395.57