Finding the Fourth Proportional to 1,921,667.99, 2,882,620.85 and 642,390.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921,667.99 : 2,882,620.85 = 642,390.57 : x
2. Step 2: Convert to fraction form
   1,921,667.99/2,882,620.85 = 642,390.57/x
3. Step 3: Cross multiply
   1,921,667.99x = 2,882,620.85 × 642,390.57
4. Step 4: Simplify right side
   1,921,667.99x = 1,851,768,447,713.43
5. Step 5: Solve for x
   x = 1,851,768,447,713.43/1,921,667.99
6. Step 6: Final answer
   x = 963,625.59