Finding the Fourth Proportional to 648,438.10, 972,196.35 and 293,622.10

Step by Step Solution

1. Step 1: Write the proportion equation
   648,438.10 : 972,196.35 = 293,622.10 : x
2. Step 2: Convert to fraction form
   648,438.10/972,196.35 = 293,622.10/x
3. Step 3: Cross multiply
   648,438.10x = 972,196.35 × 293,622.10
4. Step 4: Simplify right side
   648,438.10x = 285,458,333,899.34
5. Step 5: Solve for x
   x = 285,458,333,899.34/648,438.10
6. Step 6: Final answer
   x = 440,224.49