Finding the Fourth Proportional to 200,109.12, 299,830.48 and 140,820.24

Step by Step Solution

1. Step 1: Write the proportion equation
   200,109.12 : 299,830.48 = 140,820.24 : x
2. Step 2: Convert to fraction form
   200,109.12/299,830.48 = 140,820.24/x
3. Step 3: Cross multiply
   200,109.12x = 299,830.48 × 140,820.24
4. Step 4: Simplify right side
   200,109.12x = 42,222,200,152.92
5. Step 5: Solve for x
   x = 42,222,200,152.92/200,109.12
6. Step 6: Final answer
   x = 210,995.88