Finding the Fourth Proportional to 73,978.63, 110,968.74 and 21,388.57

Step by Step Solution

1. Step 1: Write the proportion equation
   73,978.63 : 110,968.74 = 21,388.57 : x
2. Step 2: Convert to fraction form
   73,978.63/110,968.74 = 21,388.57/x
3. Step 3: Cross multiply
   73,978.63x = 110,968.74 × 21,388.57
4. Step 4: Simplify right side
   73,978.63x = 2,373,462,663.30
5. Step 5: Solve for x
   x = 2,373,462,663.30/73,978.63
6. Step 6: Final answer
   x = 32,083.08