Finding the Fourth Proportional to 1,391.02, 1,919.61 and 761.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.02 : 1,919.61 = 761.60 : x
2. Step 2: Convert to fraction form
   1,391.02/1,919.61 = 761.60/x
3. Step 3: Cross multiply
   1,391.02x = 1,919.61 × 761.60
4. Step 4: Simplify right side
   1,391.02x = 1,461,974.98
5. Step 5: Solve for x
   x = 1,461,974.98/1,391.02
6. Step 6: Final answer
   x = 1,051.01