Finding the Fourth Proportional to 420,841.54, 631,264.71 and 140,357.98

Step by Step Solution

1. Step 1: Write the proportion equation
   420,841.54 : 631,264.71 = 140,357.98 : x
2. Step 2: Convert to fraction form
   420,841.54/631,264.71 = 140,357.98/x
3. Step 3: Cross multiply
   420,841.54x = 631,264.71 × 140,357.98
4. Step 4: Simplify right side
   420,841.54x = 88,603,039,540.89
5. Step 5: Solve for x
   x = 88,603,039,540.89/420,841.54
6. Step 6: Final answer
   x = 210,537.77