Finding the Fourth Proportional to 1,189,982.60, 1,642,204.52 and 646,141.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,982.60 : 1,642,204.52 = 646,141.31 : x
2. Step 2: Convert to fraction form
   1,189,982.60/1,642,204.52 = 646,141.31/x
3. Step 3: Cross multiply
   1,189,982.60x = 1,642,204.52 × 646,141.31
4. Step 4: Simplify right side
   1,189,982.60x = 1,061,096,179,840.72
5. Step 5: Solve for x
   x = 1,061,096,179,840.72/1,189,982.60
6. Step 6: Final answer
   x = 891,690.50