Finding the Fourth Proportional to 103,669.10, 155,667.68 and 78,737.30

Step by Step Solution

1. Step 1: Write the proportion equation
   103,669.10 : 155,667.68 = 78,737.30 : x
2. Step 2: Convert to fraction form
   103,669.10/155,667.68 = 78,737.30/x
3. Step 3: Cross multiply
   103,669.10x = 155,667.68 × 78,737.30
4. Step 4: Simplify right side
   103,669.10x = 12,256,852,820.46
5. Step 5: Solve for x
   x = 12,256,852,820.46/103,669.10
6. Step 6: Final answer
   x = 118,230.53