Finding the Fourth Proportional to 1,369.61, 1,889.99 and 772.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.61 : 1,889.99 = 772.11 : x
2. Step 2: Convert to fraction form
   1,369.61/1,889.99 = 772.11/x
3. Step 3: Cross multiply
   1,369.61x = 1,889.99 × 772.11
4. Step 4: Simplify right side
   1,369.61x = 1,459,276.32
5. Step 5: Solve for x
   x = 1,459,276.32/1,369.61
6. Step 6: Final answer
   x = 1,065.47