Finding the Fourth Proportional to 61,199.87, 91,680.12 and 42,221.57

Step by Step Solution

1. Step 1: Write the proportion equation
   61,199.87 : 91,680.12 = 42,221.57 : x
2. Step 2: Convert to fraction form
   61,199.87/91,680.12 = 42,221.57/x
3. Step 3: Cross multiply
   61,199.87x = 91,680.12 × 42,221.57
4. Step 4: Simplify right side
   61,199.87x = 3,870,878,145.79
5. Step 5: Solve for x
   x = 3,870,878,145.79/61,199.87
6. Step 6: Final answer
   x = 63,249.78