Finding the Fourth Proportional to 136,961.94, 189,026.25 and 78,817.47

Step by Step Solution

1. Step 1: Write the proportion equation
   136,961.94 : 189,026.25 = 78,817.47 : x
2. Step 2: Convert to fraction form
   136,961.94/189,026.25 = 78,817.47/x
3. Step 3: Cross multiply
   136,961.94x = 189,026.25 × 78,817.47
4. Step 4: Simplify right side
   136,961.94x = 14,898,570,788.59
5. Step 5: Solve for x
   x = 14,898,570,788.59/136,961.94
6. Step 6: Final answer
   x = 108,778.91