Finding the Fourth Proportional to 420,196.75, 630,300.62 and 139,714

Step by Step Solution

1. Step 1: Write the proportion equation
   420,196.75 : 630,300.62 = 139,714 : x
2. Step 2: Convert to fraction form
   420,196.75/630,300.62 = 139,714/x
3. Step 3: Cross multiply
   420,196.75x = 630,300.62 × 139,714
4. Step 4: Simplify right side
   420,196.75x = 88,061,820,124.11
5. Step 5: Solve for x
   x = 88,061,820,124.11/420,196.75
6. Step 6: Final answer
   x = 209,572.83