Finding the Fourth Proportional to 37,774, 52,128.12 and 21,007

Step by Step Solution

1. Step 1: Write the proportion equation
   37,774 : 52,128.12 = 21,007 : x
2. Step 2: Convert to fraction form
   37,774/52,128.12 = 21,007/x
3. Step 3: Cross multiply
   37,774x = 52,128.12 × 21,007
4. Step 4: Simplify right side
   37,774x = 1,095,055,416.84
5. Step 5: Solve for x
   x = 1,095,055,416.84/37,774
6. Step 6: Final answer
   x = 28,989.66