Finding the Fourth Proportional to 42,829.60, 64,250.52 and 13,249.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,829.60 : 64,250.52 = 13,249.96 : x
2. Step 2: Convert to fraction form
   42,829.60/64,250.52 = 13,249.96/x
3. Step 3: Cross multiply
   42,829.60x = 64,250.52 × 13,249.96
4. Step 4: Simplify right side
   42,829.60x = 851,316,819.98
5. Step 5: Solve for x
   x = 851,316,819.98/42,829.60
6. Step 6: Final answer
   x = 19,876.83