Finding the Fourth Proportional to 1,155,404.76, 1,594,428.74 and 639,145.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155,404.76 : 1,594,428.74 = 639,145.20 : x
2. Step 2: Convert to fraction form
   1,155,404.76/1,594,428.74 = 639,145.20/x
3. Step 3: Cross multiply
   1,155,404.76x = 1,594,428.74 × 639,145.20
4. Step 4: Simplify right side
   1,155,404.76x = 1,019,071,472,717.32
5. Step 5: Solve for x
   x = 1,019,071,472,717.32/1,155,404.76
6. Step 6: Final answer
   x = 882,003.87