Finding the Fourth Proportional to 139,075.86, 208,115.64 and 120,420.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,075.86 : 208,115.64 = 120,420.48 : x
2. Step 2: Convert to fraction form
   139,075.86/208,115.64 = 120,420.48/x
3. Step 3: Cross multiply
   139,075.86x = 208,115.64 × 120,420.48
4. Step 4: Simplify right side
   139,075.86x = 25,061,385,264.31
5. Step 5: Solve for x
   x = 25,061,385,264.31/139,075.86
6. Step 6: Final answer
   x = 180,199.39