Finding the Fourth Proportional to 2,157,989.32, 3,236,982.90 and 641,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157,989.32 : 3,236,982.90 = 641,665.72 : x
2. Step 2: Convert to fraction form
   2,157,989.32/3,236,982.90 = 641,665.72/x
3. Step 3: Cross multiply
   2,157,989.32x = 3,236,982.90 × 641,665.72
4. Step 4: Simplify right side
   2,157,989.32x = 2,077,060,963,156.19
5. Step 5: Solve for x
   x = 2,077,060,963,156.19/2,157,989.32
6. Step 6: Final answer
   x = 962,498.26