Finding the Fourth Proportional to 138,503.85, 191,123.83 and 78,089.34

Step by Step Solution

1. Step 1: Write the proportion equation
   138,503.85 : 191,123.83 = 78,089.34 : x
2. Step 2: Convert to fraction form
   138,503.85/191,123.83 = 78,089.34/x
3. Step 3: Cross multiply
   138,503.85x = 191,123.83 × 78,089.34
4. Step 4: Simplify right side
   138,503.85x = 14,924,733,742.97
5. Step 5: Solve for x
   x = 14,924,733,742.97/138,503.85
6. Step 6: Final answer
   x = 107,756.82