Finding the Fourth Proportional to 1,401.61, 1,934.19 and 772.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.61 : 1,934.19 = 772.15 : x
2. Step 2: Convert to fraction form
   1,401.61/1,934.19 = 772.15/x
3. Step 3: Cross multiply
   1,401.61x = 1,934.19 × 772.15
4. Step 4: Simplify right side
   1,401.61x = 1,493,484.81
5. Step 5: Solve for x
   x = 1,493,484.81/1,401.61
6. Step 6: Final answer
   x = 1,065.55