Finding the Fourth Proportional to 404,430.76, 606,646.34 and 138,193.89

Step by Step Solution

1. Step 1: Write the proportion equation
   404,430.76 : 606,646.34 = 138,193.89 : x
2. Step 2: Convert to fraction form
   404,430.76/606,646.34 = 138,193.89/x
3. Step 3: Cross multiply
   404,430.76x = 606,646.34 × 138,193.89
4. Step 4: Simplify right side
   404,430.76x = 83,834,817,578.86
5. Step 5: Solve for x
   x = 83,834,817,578.86/404,430.76
6. Step 6: Final answer
   x = 207,290.90