Finding the Fourth Proportional to 139,030.10, 191,851.89 and 78,603.70

Step by Step Solution

1. Step 1: Write the proportion equation
   139,030.10 : 191,851.89 = 78,603.70 : x
2. Step 2: Convert to fraction form
   139,030.10/191,851.89 = 78,603.70/x
3. Step 3: Cross multiply
   139,030.10x = 191,851.89 × 78,603.70
4. Step 4: Simplify right side
   139,030.10x = 15,080,268,405.99
5. Step 5: Solve for x
   x = 15,080,268,405.99/139,030.10
6. Step 6: Final answer
   x = 108,467.65