Finding the Fourth Proportional to 156,581, 216,081.78 and 89,513

Step by Step Solution

1. Step 1: Write the proportion equation
   156,581 : 216,081.78 = 89,513 : x
2. Step 2: Convert to fraction form
   156,581/216,081.78 = 89,513/x
3. Step 3: Cross multiply
   156,581x = 216,081.78 × 89,513
4. Step 4: Simplify right side
   156,581x = 19,342,128,373.14
5. Step 5: Solve for x
   x = 19,342,128,373.14/156,581
6. Step 6: Final answer
   x = 123,527.94