Finding the Fourth Proportional to 61,056.72, 91,511.25 and 31,458.40

Step by Step Solution

1. Step 1: Write the proportion equation
   61,056.72 : 91,511.25 = 31,458.40 : x
2. Step 2: Convert to fraction form
   61,056.72/91,511.25 = 31,458.40/x
3. Step 3: Cross multiply
   61,056.72x = 91,511.25 × 31,458.40
4. Step 4: Simplify right side
   61,056.72x = 2,878,797,507
5. Step 5: Solve for x
   x = 2,878,797,507/61,056.72
6. Step 6: Final answer
   x = 47,149.56