Finding the Fourth Proportional to 291,401.95, 436,992.21 and 139,443.05

Step by Step Solution

1. Step 1: Write the proportion equation
   291,401.95 : 436,992.21 = 139,443.05 : x
2. Step 2: Convert to fraction form
   291,401.95/436,992.21 = 139,443.05/x
3. Step 3: Cross multiply
   291,401.95x = 436,992.21 × 139,443.05
4. Step 4: Simplify right side
   291,401.95x = 60,935,526,648.17
5. Step 5: Solve for x
   x = 60,935,526,648.17/291,401.95
6. Step 6: Final answer
   x = 209,111.59