Finding the Fourth Proportional to 215,298, 297,111.24 and 121,090

Step by Step Solution

1. Step 1: Write the proportion equation
   215,298 : 297,111.24 = 121,090 : x
2. Step 2: Convert to fraction form
   215,298/297,111.24 = 121,090/x
3. Step 3: Cross multiply
   215,298x = 297,111.24 × 121,090
4. Step 4: Simplify right side
   215,298x = 35,977,200,051.60
5. Step 5: Solve for x
   x = 35,977,200,051.60/215,298
6. Step 6: Final answer
   x = 167,104.20