Finding the Fourth Proportional to 61,085.72, 91,624.21 and 18,964.78

Step by Step Solution

1. Step 1: Write the proportion equation
   61,085.72 : 91,624.21 = 18,964.78 : x
2. Step 2: Convert to fraction form
   61,085.72/91,624.21 = 18,964.78/x
3. Step 3: Cross multiply
   61,085.72x = 91,624.21 × 18,964.78
4. Step 4: Simplify right side
   61,085.72x = 1,737,632,985.32
5. Step 5: Solve for x
   x = 1,737,632,985.32/61,085.72
6. Step 6: Final answer
   x = 28,445.81