Finding the Fourth Proportional to 155,068.76, 213,969.30 and 91,418.87

Step by Step Solution

1. Step 1: Write the proportion equation
   155,068.76 : 213,969.30 = 91,418.87 : x
2. Step 2: Convert to fraction form
   155,068.76/213,969.30 = 91,418.87/x
3. Step 3: Cross multiply
   155,068.76x = 213,969.30 × 91,418.87
4. Step 4: Simplify right side
   155,068.76x = 19,560,831,620.69
5. Step 5: Solve for x
   x = 19,560,831,620.69/155,068.76
6. Step 6: Final answer
   x = 126,142.96