Finding the Fourth Proportional to 1,189,611, 1,641,618.72 and 645,735.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189,611 : 1,641,618.72 = 645,735.15 : x
2. Step 2: Convert to fraction form
   1,189,611/1,641,618.72 = 645,735.15/x
3. Step 3: Cross multiply
   1,189,611x = 1,641,618.72 × 645,735.15
4. Step 4: Simplify right side
   1,189,611x = 1,060,050,910,402.01
5. Step 5: Solve for x
   x = 1,060,050,910,402.01/1,189,611
6. Step 6: Final answer
   x = 891,090.37