Finding the Fourth Proportional to 1,098,622, 1,515,970.72 and 639,836.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098,622 : 1,515,970.72 = 639,836.88 : x
2. Step 2: Convert to fraction form
   1,098,622/1,515,970.72 = 639,836.88/x
3. Step 3: Cross multiply
   1,098,622x = 1,515,970.72 × 639,836.88
4. Step 4: Simplify right side
   1,098,622x = 969,973,975,656.15
5. Step 5: Solve for x
   x = 969,973,975,656.15/1,098,622
6. Step 6: Final answer
   x = 882,900.56