Finding the Fourth Proportional to 140,546.64, 210,300.72 and 84,420.80

Step by Step Solution

1. Step 1: Write the proportion equation
   140,546.64 : 210,300.72 = 84,420.80 : x
2. Step 2: Convert to fraction form
   140,546.64/210,300.72 = 84,420.80/x
3. Step 3: Cross multiply
   140,546.64x = 210,300.72 × 84,420.80
4. Step 4: Simplify right side
   140,546.64x = 17,753,755,022.98
5. Step 5: Solve for x
   x = 17,753,755,022.98/140,546.64
6. Step 6: Final answer
   x = 126,319.31