Finding the Fourth Proportional to 61.30, 91.71 and 45.98

Step by Step Solution

1. Step 1: Write the proportion equation
   61.30 : 91.71 = 45.98 : x
2. Step 2: Convert to fraction form
   61.30/91.71 = 45.98/x
3. Step 3: Cross multiply
   61.30x = 91.71 × 45.98
4. Step 4: Simplify right side
   61.30x = 4,216.37
5. Step 5: Solve for x
   x = 4,216.37/61.30
6. Step 6: Final answer
   x = 68.79