Finding the Fourth Proportional to 118,931.36, 164,123.16 and 65,215.40

Step by Step Solution

1. Step 1: Write the proportion equation
   118,931.36 : 164,123.16 = 65,215.40 : x
2. Step 2: Convert to fraction form
   118,931.36/164,123.16 = 65,215.40/x
3. Step 3: Cross multiply
   118,931.36x = 164,123.16 × 65,215.40
4. Step 4: Simplify right side
   118,931.36x = 10,703,357,528.66
5. Step 5: Solve for x
   x = 10,703,357,528.66/118,931.36
6. Step 6: Final answer
   x = 89,996.09