Finding the Fourth Proportional to 1,355.01, 1,870.03 and 765.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.01 : 1,870.03 = 765.64 : x
2. Step 2: Convert to fraction form
   1,355.01/1,870.03 = 765.64/x
3. Step 3: Cross multiply
   1,355.01x = 1,870.03 × 765.64
4. Step 4: Simplify right side
   1,355.01x = 1,431,769.77
5. Step 5: Solve for x
   x = 1,431,769.77/1,355.01
6. Step 6: Final answer
   x = 1,056.65