Finding the Fourth Proportional to 3,139.71, 4,707.72 and 1,192.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.71 : 4,707.72 = 1,192.05 : x
2. Step 2: Convert to fraction form
   3,139.71/4,707.72 = 1,192.05/x
3. Step 3: Cross multiply
   3,139.71x = 4,707.72 × 1,192.05
4. Step 4: Simplify right side
   3,139.71x = 5,611,837.63
5. Step 5: Solve for x
   x = 5,611,837.63/3,139.71
6. Step 6: Final answer
   x = 1,787.37