Finding the Fourth Proportional to 1,238,150.88, 1,857,353.59 and 428,533.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238,150.88 : 1,857,353.59 = 428,533.71 : x
2. Step 2: Convert to fraction form
   1,238,150.88/1,857,353.59 = 428,533.71/x
3. Step 3: Cross multiply
   1,238,150.88x = 1,857,353.59 × 428,533.71
4. Step 4: Simplify right side
   1,238,150.88x = 795,938,615,417.75
5. Step 5: Solve for x
   x = 795,938,615,417.75/1,238,150.88
6. Step 6: Final answer
   x = 642,844.61