Finding the Fourth Proportional to 37,691.21, 52,010.01 and 21,780.78

Step by Step Solution

1. Step 1: Write the proportion equation
   37,691.21 : 52,010.01 = 21,780.78 : x
2. Step 2: Convert to fraction form
   37,691.21/52,010.01 = 21,780.78/x
3. Step 3: Cross multiply
   37,691.21x = 52,010.01 × 21,780.78
4. Step 4: Simplify right side
   37,691.21x = 1,132,818,585.61
5. Step 5: Solve for x
   x = 1,132,818,585.61/37,691.21
6. Step 6: Final answer
   x = 30,055.25