Finding the Fourth Proportional to 1,356.63, 1,870.34 and 1,077.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.63 : 1,870.34 = 1,077.78 : x
2. Step 2: Convert to fraction form
   1,356.63/1,870.34 = 1,077.78/x
3. Step 3: Cross multiply
   1,356.63x = 1,870.34 × 1,077.78
4. Step 4: Simplify right side
   1,356.63x = 2,015,816.67
5. Step 5: Solve for x
   x = 2,015,816.67/1,356.63
6. Step 6: Final answer
   x = 1,485.90