Finding the Fourth Proportional to 21,780.42, 32,678.82 and 10,085.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,780.42 : 32,678.82 = 10,085.46 : x
2. Step 2: Convert to fraction form
   21,780.42/32,678.82 = 10,085.46/x
3. Step 3: Cross multiply
   21,780.42x = 32,678.82 × 10,085.46
4. Step 4: Simplify right side
   21,780.42x = 329,580,931.96
5. Step 5: Solve for x
   x = 329,580,931.96/21,780.42
6. Step 6: Final answer
   x = 15,131.98