Finding the Fourth Proportional to 288,897.30, 433,280.34 and 139,061.07

Step by Step Solution

1. Step 1: Write the proportion equation
   288,897.30 : 433,280.34 = 139,061.07 : x
2. Step 2: Convert to fraction form
   288,897.30/433,280.34 = 139,061.07/x
3. Step 3: Cross multiply
   288,897.30x = 433,280.34 × 139,061.07
4. Step 4: Simplify right side
   288,897.30x = 60,252,427,690.36
5. Step 5: Solve for x
   x = 60,252,427,690.36/288,897.30
6. Step 6: Final answer
   x = 208,560.02