Finding the Fourth Proportional to 1,359.99, 1,877.70 and 856.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.99 : 1,877.70 = 856.07 : x
2. Step 2: Convert to fraction form
   1,359.99/1,877.70 = 856.07/x
3. Step 3: Cross multiply
   1,359.99x = 1,877.70 × 856.07
4. Step 4: Simplify right side
   1,359.99x = 1,607,442.64
5. Step 5: Solve for x
   x = 1,607,442.64/1,359.99
6. Step 6: Final answer
   x = 1,181.95