Finding the Fourth Proportional to 1,351.79, 1,861.08 and 1,177.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.79 : 1,861.08 = 1,177.13 : x
2. Step 2: Convert to fraction form
   1,351.79/1,861.08 = 1,177.13/x
3. Step 3: Cross multiply
   1,351.79x = 1,861.08 × 1,177.13
4. Step 4: Simplify right side
   1,351.79x = 2,190,733.34
5. Step 5: Solve for x
   x = 2,190,733.34/1,351.79
6. Step 6: Final answer
   x = 1,620.62