Finding the Third Proportional to 1,056.19 and 2,139.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.19 : 2,139.47 = 2,139.47 : x
2. Step 2: Convert to fraction form
   1,056.19/2,139.47 = 2,139.47/x
3. Step 3: Cross multiply
   1,056.19x = 2,139.47 × 2,139.47
4. Step 4: Simplify right side
   1,056.19x = 4,577,326.53
5. Step 5: Solve for x
   x = 4,577,326.53/1,056.19
6. Step 6: Final answer
   x = 4,333.82