Finding the Fourth Proportional to 37,978, 52,409.80 and 21,215.12

Step by Step Solution

1. Step 1: Write the proportion equation
   37,978 : 52,409.80 = 21,215.12 : x
2. Step 2: Convert to fraction form
   37,978/52,409.80 = 21,215.12/x
3. Step 3: Cross multiply
   37,978x = 52,409.80 × 21,215.12
4. Step 4: Simplify right side
   37,978x = 1,111,880,196.18
5. Step 5: Solve for x
   x = 1,111,880,196.18/37,978
6. Step 6: Final answer
   x = 29,276.95