Finding the Fourth Proportional to 1,155,980.18, 1,595,573.52 and 672,639

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155,980.18 : 1,595,573.52 = 672,639 : x
2. Step 2: Convert to fraction form
   1,155,980.18/1,595,573.52 = 672,639/x
3. Step 3: Cross multiply
   1,155,980.18x = 1,595,573.52 × 672,639
4. Step 4: Simplify right side
   1,155,980.18x = 1,073,244,976,919.28
5. Step 5: Solve for x
   x = 1,073,244,976,919.28/1,155,980.18
6. Step 6: Final answer
   x = 928,428.53