Finding the Fourth Proportional to 1,189,617, 1,641,627 and 645,741.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,617 : 1,641,627 = 645,741.18 : x
2. Step 2: Convert to fraction form
   1,189,617/1,641,627 = 645,741.18/x
3. Step 3: Cross multiply
   1,189,617x = 1,641,627 × 645,741.18
4. Step 4: Simplify right side
   1,189,617x = 1,060,066,156,099.86
5. Step 5: Solve for x
   x = 1,060,066,156,099.86/1,189,617
6. Step 6: Final answer
   x = 891,098.69