Finding the Fourth Proportional to 1,003,404.38, 1,384,963.53 and 621,213.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003,404.38 : 1,384,963.53 = 621,213.98 : x
2. Step 2: Convert to fraction form
   1,003,404.38/1,384,963.53 = 621,213.98/x
3. Step 3: Cross multiply
   1,003,404.38x = 1,384,963.53 × 621,213.98
4. Step 4: Simplify right side
   1,003,404.38x = 860,358,706,626.15
5. Step 5: Solve for x
   x = 860,358,706,626.15/1,003,404.38
6. Step 6: Final answer
   x = 857,439.66