Finding the Fourth Proportional to 60,978.72, 91,471.14 and 19,428.96

Step by Step Solution

1. Step 1: Write the proportion equation
   60,978.72 : 91,471.14 = 19,428.96 : x
2. Step 2: Convert to fraction form
   60,978.72/91,471.14 = 19,428.96/x
3. Step 3: Cross multiply
   60,978.72x = 91,471.14 × 19,428.96
4. Step 4: Simplify right side
   60,978.72x = 1,777,189,120.21
5. Step 5: Solve for x
   x = 1,777,189,120.21/60,978.72
6. Step 6: Final answer
   x = 29,144.41