Finding the Fourth Proportional to 37,780.42, 52,138.73 and 21,861.78

Step by Step Solution

1. Step 1: Write the proportion equation
   37,780.42 : 52,138.73 = 21,861.78 : x
2. Step 2: Convert to fraction form
   37,780.42/52,138.73 = 21,861.78/x
3. Step 3: Cross multiply
   37,780.42x = 52,138.73 × 21,861.78
4. Step 4: Simplify right side
   37,780.42x = 1,139,845,444.74
5. Step 5: Solve for x
   x = 1,139,845,444.74/37,780.42
6. Step 6: Final answer
   x = 30,170.27