Finding the Fourth Proportional to 138,411.70, 207,271.94 and 91,410.10

Step by Step Solution

1. Step 1: Write the proportion equation
   138,411.70 : 207,271.94 = 91,410.10 : x
2. Step 2: Convert to fraction form
   138,411.70/207,271.94 = 91,410.10/x
3. Step 3: Cross multiply
   138,411.70x = 207,271.94 × 91,410.10
4. Step 4: Simplify right side
   138,411.70x = 18,946,748,762.59
5. Step 5: Solve for x
   x = 18,946,748,762.59/138,411.70
6. Step 6: Final answer
   x = 136,886.90