Finding the Fourth Proportional to 39,670.42, 54,748.71 and 21,768.91

Step by Step Solution

1. Step 1: Write the proportion equation
   39,670.42 : 54,748.71 = 21,768.91 : x
2. Step 2: Convert to fraction form
   39,670.42/54,748.71 = 21,768.91/x
3. Step 3: Cross multiply
   39,670.42x = 54,748.71 × 21,768.91
4. Step 4: Simplify right side
   39,670.42x = 1,191,819,740.61
5. Step 5: Solve for x
   x = 1,191,819,740.61/39,670.42
6. Step 6: Final answer
   x = 30,043.03