Finding the Fourth Proportional to 35,978.16, 53,982.80 and 19,318.72

Step by Step Solution

1. Step 1: Write the proportion equation
   35,978.16 : 53,982.80 = 19,318.72 : x
2. Step 2: Convert to fraction form
   35,978.16/53,982.80 = 19,318.72/x
3. Step 3: Cross multiply
   35,978.16x = 53,982.80 × 19,318.72
4. Step 4: Simplify right side
   35,978.16x = 1,042,878,598.02
5. Step 5: Solve for x
   x = 1,042,878,598.02/35,978.16
6. Step 6: Final answer
   x = 28,986.44