Finding the Fourth Proportional to 42,830.48, 64,251.95 and 13,250.62

Step by Step Solution

1. Step 1: Write the proportion equation
   42,830.48 : 64,251.95 = 13,250.62 : x
2. Step 2: Convert to fraction form
   42,830.48/64,251.95 = 13,250.62/x
3. Step 3: Cross multiply
   42,830.48x = 64,251.95 × 13,250.62
4. Step 4: Simplify right side
   42,830.48x = 851,378,154.72
5. Step 5: Solve for x
   x = 851,378,154.72/42,830.48
6. Step 6: Final answer
   x = 19,877.86