Finding the Fourth Proportional to 1,155,404.51, 1,594,428.39 and 639,144.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155,404.51 : 1,594,428.39 = 639,144.95 : x
2. Step 2: Convert to fraction form
   1,155,404.51/1,594,428.39 = 639,144.95/x
3. Step 3: Cross multiply
   1,155,404.51x = 1,594,428.39 × 639,144.95
4. Step 4: Simplify right side
   1,155,404.51x = 1,019,070,853,605.13
5. Step 5: Solve for x
   x = 1,019,070,853,605.13/1,155,404.51
6. Step 6: Final answer
   x = 882,003.53