Finding the Fourth Proportional to 38,645.10, 53,330.23 and 21,878.10

Step by Step Solution

1. Step 1: Write the proportion equation
   38,645.10 : 53,330.23 = 21,878.10 : x
2. Step 2: Convert to fraction form
   38,645.10/53,330.23 = 21,878.10/x
3. Step 3: Cross multiply
   38,645.10x = 53,330.23 × 21,878.10
4. Step 4: Simplify right side
   38,645.10x = 1,166,763,838.31
5. Step 5: Solve for x
   x = 1,166,763,838.31/38,645.10
6. Step 6: Final answer
   x = 30,191.77