Finding the Fourth Proportional to 900,900.39, 1,243,242.61 and 493,002.21

Step by Step Solution

1. Step 1: Write the proportion equation
   900,900.39 : 1,243,242.61 = 493,002.21 : x
2. Step 2: Convert to fraction form
   900,900.39/1,243,242.61 = 493,002.21/x
3. Step 3: Cross multiply
   900,900.39x = 1,243,242.61 × 493,002.21
4. Step 4: Simplify right side
   900,900.39x = 612,921,348,079.96
5. Step 5: Solve for x
   x = 612,921,348,079.96/900,900.39
6. Step 6: Final answer
   x = 680,343.09