Finding the Fourth Proportional to 1,219,997.89, 1,682,100.51 and 989,903.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,219,997.89 : 1,682,100.51 = 989,903.62 : x
2. Step 2: Convert to fraction form
   1,219,997.89/1,682,100.51 = 989,903.62/x
3. Step 3: Cross multiply
   1,219,997.89x = 1,682,100.51 × 989,903.62
4. Step 4: Simplify right side
   1,219,997.89x = 1,665,117,384,052.85
5. Step 5: Solve for x
   x = 1,665,117,384,052.85/1,219,997.89
6. Step 6: Final answer
   x = 1,364,852.68