Finding the Fourth Proportional to 91,828.10, 137,742.15 and 91,828.10

Step by Step Solution

1. Step 1: Write the proportion equation
   91,828.10 : 137,742.15 = 91,828.10 : x
2. Step 2: Convert to fraction form
   91,828.10/137,742.15 = 91,828.10/x
3. Step 3: Cross multiply
   91,828.10x = 137,742.15 × 91,828.10
4. Step 4: Simplify right side
   91,828.10x = 12,648,599,924.42
5. Step 5: Solve for x
   x = 12,648,599,924.42/91,828.10
6. Step 6: Final answer
   x = 137,742.15