Finding the Fourth Proportional to 91,615.60, 137,443.02 and 28,434.40

Step by Step Solution

1. Step 1: Write the proportion equation
   91,615.60 : 137,443.02 = 28,434.40 : x
2. Step 2: Convert to fraction form
   91,615.60/137,443.02 = 28,434.40/x
3. Step 3: Cross multiply
   91,615.60x = 137,443.02 × 28,434.40
4. Step 4: Simplify right side
   91,615.60x = 3,908,109,807.89
5. Step 5: Solve for x
   x = 3,908,109,807.89/91,615.60
6. Step 6: Final answer
   x = 42,657.69