Finding the Fourth Proportional to 1,122,789.32, 1,549,447.71 and 639,354.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,122,789.32 : 1,549,447.71 = 639,354.45 : x
2. Step 2: Convert to fraction form
   1,122,789.32/1,549,447.71 = 639,354.45/x
3. Step 3: Cross multiply
   1,122,789.32x = 1,549,447.71 × 639,354.45
4. Step 4: Simplify right side
   1,122,789.32x = 990,646,291,462.89
5. Step 5: Solve for x
   x = 990,646,291,462.89/1,122,789.32
6. Step 6: Final answer
   x = 882,308.26