Finding the Fourth Proportional to 53,642.47, 74,009.49 and 30,978.47

Step by Step Solution

1. Step 1: Write the proportion equation
   53,642.47 : 74,009.49 = 30,978.47 : x
2. Step 2: Convert to fraction form
   53,642.47/74,009.49 = 30,978.47/x
3. Step 3: Cross multiply
   53,642.47x = 74,009.49 × 30,978.47
4. Step 4: Simplify right side
   53,642.47x = 2,292,700,557.00
5. Step 5: Solve for x
   x = 2,292,700,557.00/53,642.47
6. Step 6: Final answer
   x = 42,740.40