Finding the Fourth Proportional to 1,355.59, 1,870.64 and 766.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.59 : 1,870.64 = 766.01 : x
2. Step 2: Convert to fraction form
   1,355.59/1,870.64 = 766.01/x
3. Step 3: Cross multiply
   1,355.59x = 1,870.64 × 766.01
4. Step 4: Simplify right side
   1,355.59x = 1,432,926.45
5. Step 5: Solve for x
   x = 1,432,926.45/1,355.59
6. Step 6: Final answer
   x = 1,057.05