Finding the Fourth Proportional to 91,311, 136,980.13 and 28,125.83

Step by Step Solution

1. Step 1: Write the proportion equation
   91,311 : 136,980.13 = 28,125.83 : x
2. Step 2: Convert to fraction form
   91,311/136,980.13 = 28,125.83/x
3. Step 3: Cross multiply
   91,311x = 136,980.13 × 28,125.83
4. Step 4: Simplify right side
   91,311x = 3,852,680,121.89
5. Step 5: Solve for x
   x = 3,852,680,121.89/91,311
6. Step 6: Final answer
   x = 42,192.95