Finding the Fourth Proportional to 139,022.20, 191,849.70 and 78,592.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,022.20 : 191,849.70 = 78,592.76 : x
2. Step 2: Convert to fraction form
   139,022.20/191,849.70 = 78,592.76/x
3. Step 3: Cross multiply
   139,022.20x = 191,849.70 × 78,592.76
4. Step 4: Simplify right side
   139,022.20x = 15,077,997,428.17
5. Step 5: Solve for x
   x = 15,077,997,428.17/139,022.20
6. Step 6: Final answer
   x = 108,457.48