Finding the Fourth Proportional to 61,109.46, 91,678.56 and 18,987.42

Step by Step Solution

1. Step 1: Write the proportion equation
   61,109.46 : 91,678.56 = 18,987.42 : x
2. Step 2: Convert to fraction form
   61,109.46/91,678.56 = 18,987.42/x
3. Step 3: Cross multiply
   61,109.46x = 91,678.56 × 18,987.42
4. Step 4: Simplify right side
   61,109.46x = 1,740,739,323.72
5. Step 5: Solve for x
   x = 1,740,739,323.72/61,109.46
6. Step 6: Final answer
   x = 28,485.59