Finding the Fourth Proportional to 52,748.58, 72,786.60 and 42,020.78

Step by Step Solution

1. Step 1: Write the proportion equation
   52,748.58 : 72,786.60 = 42,020.78 : x
2. Step 2: Convert to fraction form
   52,748.58/72,786.60 = 42,020.78/x
3. Step 3: Cross multiply
   52,748.58x = 72,786.60 × 42,020.78
4. Step 4: Simplify right side
   52,748.58x = 3,058,549,341.62
5. Step 5: Solve for x
   x = 3,058,549,341.62/52,748.58
6. Step 6: Final answer
   x = 57,983.53