Finding the Fourth Proportional to 1,355.22, 1,870.25 and 765.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.22 : 1,870.25 = 765.84 : x
2. Step 2: Convert to fraction form
   1,355.22/1,870.25 = 765.84/x
3. Step 3: Cross multiply
   1,355.22x = 1,870.25 × 765.84
4. Step 4: Simplify right side
   1,355.22x = 1,432,312.26
5. Step 5: Solve for x
   x = 1,432,312.26/1,355.22
6. Step 6: Final answer
   x = 1,056.89