Finding the Fourth Proportional to 1,069,144.59, 1,475,419.35 and 639,424.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069,144.59 : 1,475,419.35 = 639,424.74 : x
2. Step 2: Convert to fraction form
   1,069,144.59/1,475,419.35 = 639,424.74/x
3. Step 3: Cross multiply
   1,069,144.59x = 1,475,419.35 × 639,424.74
4. Step 4: Simplify right side
   1,069,144.59x = 943,419,634,264.72
5. Step 5: Solve for x
   x = 943,419,634,264.72/1,069,144.59
6. Step 6: Final answer
   x = 882,406.03