Finding the Fourth Proportional to 76,978, 115,473.48 and 21,574

Step by Step Solution

1. Step 1: Write the proportion equation
   76,978 : 115,473.48 = 21,574 : x
2. Step 2: Convert to fraction form
   76,978/115,473.48 = 21,574/x
3. Step 3: Cross multiply
   76,978x = 115,473.48 × 21,574
4. Step 4: Simplify right side
   76,978x = 2,491,224,857.52
5. Step 5: Solve for x
   x = 2,491,224,857.52/76,978
6. Step 6: Final answer
   x = 32,362.82