Finding the Fourth Proportional to 104,196.15, 156,128.15 and 66,725.40

Step by Step Solution

1. Step 1: Write the proportion equation
   104,196.15 : 156,128.15 = 66,725.40 : x
2. Step 2: Convert to fraction form
   104,196.15/156,128.15 = 66,725.40/x
3. Step 3: Cross multiply
   104,196.15x = 156,128.15 × 66,725.40
4. Step 4: Simplify right side
   104,196.15x = 10,417,712,926.38
5. Step 5: Solve for x
   x = 10,417,712,926.38/104,196.15
6. Step 6: Final answer
   x = 99,981.75