Finding the Fourth Proportional to 1,387.08, 1,914.10 and 766.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.08 : 1,914.10 = 766.12 : x
2. Step 2: Convert to fraction form
   1,387.08/1,914.10 = 766.12/x
3. Step 3: Cross multiply
   1,387.08x = 1,914.10 × 766.12
4. Step 4: Simplify right side
   1,387.08x = 1,466,430.29
5. Step 5: Solve for x
   x = 1,466,430.29/1,387.08
6. Step 6: Final answer
   x = 1,057.21