Finding the Fourth Proportional to 1,215,300.27, 1,677,131.96 and 671,448.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,300.27 : 1,677,131.96 = 671,448.57 : x
2. Step 2: Convert to fraction form
   1,215,300.27/1,677,131.96 = 671,448.57/x
3. Step 3: Cross multiply
   1,215,300.27x = 1,677,131.96 × 671,448.57
4. Step 4: Simplify right side
   1,215,300.27x = 1,126,107,857,919.13
5. Step 5: Solve for x
   x = 1,126,107,857,919.13/1,215,300.27
6. Step 6: Final answer
   x = 926,608.75