Finding the Fourth Proportional to 1,216,312.72, 1,678,778.04 and 707,308.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216,312.72 : 1,678,778.04 = 707,308.72 : x
2. Step 2: Convert to fraction form
   1,216,312.72/1,678,778.04 = 707,308.72/x
3. Step 3: Cross multiply
   1,216,312.72x = 1,678,778.04 × 707,308.72
4. Step 4: Simplify right side
   1,216,312.72x = 1,187,414,346,636.51
5. Step 5: Solve for x
   x = 1,187,414,346,636.51/1,216,312.72
6. Step 6: Final answer
   x = 976,241.00